Zenith factory manuals show up on e-bay often.
They are marked CM###. Supplements will be marked
CM### s-1 etc. Sometimes there are separate tuning system manuals
marked TS##. Since your Avanti has click tuners you dont need
that. IIRC the D-line manuals were about CM120.
The big thing with this chassis is to CHANGE ALL the 22-5001 caps
that are white. Orange ones are OK. IIRC there are 2 on the FBT & 3 more under the chassis. Must use the right sub or they WILL short.
They open & the HV goes up a few KV for each one. That will kill
the tripler, divider & CRT socket. HV can reach 4++0-50 KV if all go bad.
You should see the lightning show
73 Zeno
LFOD !